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(No Model.) 2 Sheets-Sheet 1.

L. WHITE. MAG'HINE FOR FORMING SEAMLESS TUBES. NO. 432,463. Patented July 15, 1890.

WITNESSES:

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2 sheets-sheet 2 (No Model.)

L. WHITE. MACHINE FOR FORMING SEAM'LESS TUBES.

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A UNITED STATES LYMAN VHITE, OF

PATENT OFFICE.

VVATERBURY, CONNECTICUT, ASSIGNOR TO RANDOLPH & CLOXVES, OF SAME PLACE.

MACHINE FOR FORM IN G S-EAMLESS TUBES.

SPECIFICATION forming part of Letters Patent No. 432,463, dated July 15, 1890.

Application filed November 28, 1888. Renewed April 12, 1890. Serial No. 347,590. (No model.)

To all whom it may concern.-

Be it known that I, LYMAN WVHITE, of aterbury, in the county of New Haven and State of Connecticut, have invented a new and Improved Reducing Roll and Machine for Forming Seamless Metal Tubes, of which the following is a full, clear, and exact description.

My invention relates to an improvement in reducing rolls and machines for forming [O seamless metal tubes, and has for its object to provide a roll which will simultaneously lengthen, feed, and properly shape a seamless tube from a cylindrical casting; and the further object of the invention is to provide a simple, compact, and durable machine adapt ed for use in connection with the rolls.

My invention consists in the construction and combination of the several parts of the machine, as will be hereinafter fullyset forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forminga part of this specification, in which similar figures of reference indicate corresponding parts in all the views. Figure 1 is a side elevation of the machine.

Fig. 2 is an end view of the same, the mandrel and tube being in section. Fig. 3 is a vertical section through the casting and mandrel, illustrating the drawing-rolls in side elevation and the tube as partly finished; and Fig. 4 is a side elevation of one of the rolls.

The frame of the machine consists of two parallel side pieces 10, united by suitable webs or otherwise, as desired, and upon the 5 side pieces a bed 11 is permanently secured.

At or near each end of the frame a center post 12 is located upon the bed, one or both of which posts may be so attached as to be readily detached or capable of being C011V6l1- iently swung to one side. At or near the center of the frame, upon the upper face, a rollhead 13 is rigidly fastened extending transversely thereof and perpendicularly therefrom. The construction of the roll-head is similar to that shown and described in an application for Letters Patent for an improvement in machines for rolling seamless metal tubes filed by myself on even date herewith. The roll-head is ordinarily made in two sections recessed to form an interior chamber, the said sections being bolted together or otherwise secured. In the center of the head a circular opening 14: is produced, and at each side of the said opening, in horizontal alignment therewith, one end of a shaft 15 isjour- '55 naled in adjustable bearings 16, as shown in Fig. 2, carrying within the head a spur-wheel 17, as shown in dotted lines in said figure. The shafts 15 are carried rearward from the rollhead and journaled in suitable bearings secured to the rear end of the frame, as shown in Fig. 1. Aspur' wheel 18 is usually attached to the rear extremity of each shaft 15, meshing with another gear 19 upon a drive-shaft 20, preferably located at a right angle to the end of the frame.

Adjustable bearings 21 are introduced in the sections of the roll-head, held to slide diagonally of said sections to and from the central opening 1th- The several aligning bearin gs 21 are adapted to journal a short shaft 22, carrying a pinion 23 within the chamber or recess of the head and a drawing-roll 24: at the forward extremity, which extends beyond the head. The pinions mesh with the spur-wheel of the contiguous line-shaft 15, and the rolls are so arranged as to surround the central opening 14, as illustrated in Fig. 2. The arrangement of the rolls and the means of driving them are similar to that illustrated and described in the application filed of even date herewith and heretofore mentioned. In this connection I desire it to be understood that other mechanism may be substituted for driving the rolls without departing from the spirit of the invention.

The construction of the reducing-rolls is fully illustrated in Figs. 3 and 4, wherein it will be observed that the rear end 25 is of greater diameter than the forward end 26, and that the two op posing peripheral surfaces are connected by a spirally-fluted inclined surface 27, made up of a series of alternating essentially spiral U shaped grooves and spiral (substantially cylindrical) ribs which vanish into the said end surfaces. The mandrel 28 employed is held firmly between the center posts and is circular in cross-section, consisting of a body portion a of a diameter equal to the bore of the casting 29 to be rolled, as shown in Fig. 3, and a reduced extension or neck 1). Upon the neck I) of the mandrelstem at its union with the body a mandrel 30 is loosely mounted, conical the greater portion of its length and terminating at the rear in a true cylindrical surface (I, fully illustrated in Fig. The rotary mandrel is held in position by a collar 31, equal in diameter with the reduced end of the mandrel, and the remaining length of the mandrel-stem neck is covered by a sleeve of the same diameter or essentially so of the collar. The mandrel is of a length corresponding to the width of the reducing-rolls and is located in vertical alignment with them, the rear or smoothing and finishing surface of the rolls registering with the cylindrical end of the mandrel.

In operation the casting to be rolled is introduced upon the body of the mandrel-stem, and the mandrel-stem carrying the mandrel is passed through the central opening of the head and secured by the center posts, as shown in Fig. 1. The casting is now fed to the rolls and engaged by the front or forward peripheral surface, and as the rolls are revolved the spiral inclined surface also engages, whereupon the easting is drawn forward, compressed upon the triplet, which revolves meanwhile, reduced, and lengthened out, the perfect contour of the tube being completed while between the rear peripheral surfaces of the said rolls and the cylindrical surface of the mandrel, as illustrated in Fig. J.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

].-The combination, with the frame, the stationary center posts, and the mandrel held between said posts, of a fixed head on the frame between the posts and having a central mandrel-opening and conical reducing and tube-feeding rolls journaled in said head around the mandrelopening with their axes parallel with the axis of the mandrel, the smaller ends of the rollers being their front ends, and each roll having its larger end cylindrical anda spiral rib or (lute leading from its forward end thereto and vanishing, substantially as set forth.

2. The combination, with the rotary conical mandrel, of the conical reducing-rolls arranged equidistant around the mandrel parallel with its axis with their smaller ends placed oppositely to the smaller end of the mandrel, substantially as set forth.

The combination, with the rotary conical mandrel having its smaller rear end terminating in a true cylindrical surface, of the reducing-rolls placed equidistant around the mandrel parallel with its axis, and each having a cylindrical diameter 24, connected by a spirally-fluted incline plane with the smaller front ends of the rollers, substantially as set forth.

at. The combination of the mandrel-stem having a body Ct and a neck I), the conical mandrel on the said neck with its larger end flush with the surface of the body and terminat-ing at its forward end in a true cylindrical surface (Z, the retaining-collar 31 and the tube 32 on the neck and of the same diameter as the surface (Z, with the reducingrolls 26 parallel with the mandrel at equal distances around it in transverse alignment, each roll having its rear end cylindrical and connected with its smaller front end by a spirally-fluted incline plane, substantially as set forth.

5. The combination, with the frame, the stationary center posts, the mandrel-stem held between the center posts and the mandrel, of the stationary roll-head mounted on the frame and having an opening, in which. is located the said mandrel, and the rotary reducing and tube-feeding rolls journaled in said head at equidistant points around the opening, and each having a cylindrical rear-end surface and a spirally-fluted inclined plane extending from their forward ends and vanishing into said cylindrical end surfaces, substantially as set forth.

LYMAN \VI'IITE.

\Vit n esses:

Ltrcrnx F. learns, STEPHEN W. KnLLoco. 

